* Driver private area in the SCSI command structure.
*/
struct sym_ucmd { /* Override the SCSI pointer structure */
- struct completion *eh_done; /* For error handling */
+ struct completion *eh_done; /* SCSI error handling */
};
#define SYM_UCMD_PTR(cmd) ((struct sym_ucmd *)(&(cmd)->SCp))
{
struct sym_hcb *np = dev_id;
+ /* Avoid spinloop trying to handle interrupts on frozen device */
+ if (pci_channel_offline(np->s.device))
+ return IRQ_NONE;
+
if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("[");
spin_lock(np->s.host->host_lock);
struct sym_hcb *np = SYM_SOFTC_PTR(cmd);
struct sym_ucmd *ucmd = SYM_UCMD_PTR(cmd);
struct Scsi_Host *host = cmd->device->host;
+ struct pci_dev *pdev = np->s.device;
SYM_QUEHEAD *qp;
int cmd_queued = 0;
int sts = -1;
dev_warn(&cmd->device->sdev_gendev, "%s operation started.\n", opname);
+ /* We may be in an error condition because the PCI bus
+ * went down. In this case, we need to wait until the
+ * PCI bus is reset, the card is reset, and only then
+ * proceed with the scsi error recovery. There's no
+ * point in hurrying; take a leisurely wait.
+ */
+#define WAIT_FOR_PCI_RECOVERY 35
+ if (pci_channel_offline(pdev)) {
+ struct host_data *hostdata = shost_priv(host);
+ struct completion *io_reset;
+ int finished_reset = 0;
+ init_completion(&eh_done);
+ spin_lock_irq(host->host_lock);
+ /* Make sure we didn't race */
+ if (pci_channel_offline(pdev)) {
+ if (!hostdata->io_reset)
+ hostdata->io_reset = &eh_done;
+ io_reset = hostdata->io_reset;
+ } else {
+ io_reset = NULL;
+ }
+
+ if (!pci_channel_offline(pdev))
+ finished_reset = 1;
+ spin_unlock_irq(host->host_lock);
+ if (!finished_reset)
+ finished_reset = wait_for_completion_timeout(io_reset,
+ WAIT_FOR_PCI_RECOVERY*HZ);
+ if (!finished_reset)
+ return SCSI_FAILED;
+ }
+
spin_lock_irq(host->host_lock);
/* This one is queued in some place -> to wait for completion */
FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
break;
case SYM_EH_HOST_RESET:
sym_reset_scsi_bus(np, 0);
- sym_start_up (np, 1);
+ sym_start_up(np, 1);
sts = 0;
break;
default:
/*
* Start the SCRIPTS.
*/
- sym_start_up (np, 1);
+ sym_start_up(np, 1);
/*
* Start the timer daemon
attach_count--;
}
+/**
+ * sym2_io_error_detected() - called when PCI error is detected
+ * @pdev: pointer to PCI device
+ * @state: current state of the PCI slot
+ */
+static pci_ers_result_t sym2_io_error_detected(struct pci_dev *pdev,
+ enum pci_channel_state state)
+{
+ /* If slot is permanently frozen, turn everything off */
+ if (state == pci_channel_io_perm_failure) {
+ sym2_remove(pdev);
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+
+ disable_irq(pdev->irq);
+ pci_disable_device(pdev);
+
+ /* Request that MMIO be enabled, so register dump can be taken. */
+ return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
+/**
+ * sym2_io_slot_dump - Enable MMIO and dump debug registers
+ * @pdev: pointer to PCI device
+ */
+static pci_ers_result_t sym2_io_slot_dump(struct pci_dev *pdev)
+{
+ struct sym_hcb *np = pci_get_drvdata(pdev);
+
+ sym_dump_registers(np);
+
+ /* Request a slot reset. */
+ return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * sym2_reset_workarounds - hardware-specific work-arounds
+ *
+ * This routine is similar to sym_set_workarounds(), except
+ * that, at this point, we already know that the device was
+ * succesfully intialized at least once before, and so most
+ * of the steps taken there are un-needed here.
+ */
+static void sym2_reset_workarounds(struct pci_dev *pdev)
+{
+ u_char revision;
+ u_short status_reg;
+ struct sym_chip *chip;
+
+ pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
+ chip = sym_lookup_chip_table(pdev->device, revision);
+
+ /* Work around for errant bit in 895A, in a fashion
+ * similar to what is done in sym_set_workarounds().
+ */
+ pci_read_config_word(pdev, PCI_STATUS, &status_reg);
+ if (!(chip->features & FE_66MHZ) && (status_reg & PCI_STATUS_66MHZ)) {
+ status_reg = PCI_STATUS_66MHZ;
+ pci_write_config_word(pdev, PCI_STATUS, status_reg);
+ pci_read_config_word(pdev, PCI_STATUS, &status_reg);
+ }
+}
+
+/**
+ * sym2_io_slot_reset() - called when the pci bus has been reset.
+ * @pdev: pointer to PCI device
+ *
+ * Restart the card from scratch.
+ */
+static pci_ers_result_t sym2_io_slot_reset(struct pci_dev *pdev)
+{
+ struct sym_hcb *np = pci_get_drvdata(pdev);
+
+ printk(KERN_INFO "%s: recovering from a PCI slot reset\n",
+ sym_name(np));
+
+ if (pci_enable_device(pdev)) {
+ printk(KERN_ERR "%s: Unable to enable after PCI reset\n",
+ sym_name(np));
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+
+ pci_set_master(pdev);
+ enable_irq(pdev->irq);
+
+ /* If the chip can do Memory Write Invalidate, enable it */
+ if (np->features & FE_WRIE) {
+ if (pci_set_mwi(pdev))
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+
+ /* Perform work-arounds, analogous to sym_set_workarounds() */
+ sym2_reset_workarounds(pdev);
+
+ /* Perform host reset only on one instance of the card */
+ if (PCI_FUNC(pdev->devfn) == 0) {
+ if (sym_reset_scsi_bus(np, 0)) {
+ printk(KERN_ERR "%s: Unable to reset scsi host\n",
+ sym_name(np));
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+ sym_start_up(np, 1);
+ }
+
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * sym2_io_resume() - resume normal ops after PCI reset
+ * @pdev: pointer to PCI device
+ *
+ * Called when the error recovery driver tells us that its
+ * OK to resume normal operation. Use completion to allow
+ * halted scsi ops to resume.
+ */
+static void sym2_io_resume(struct pci_dev *pdev)
+{
+ struct sym_hcb *np = pci_get_drvdata(pdev);
+ struct Scsi_Host *shost = np->s.host;
+ struct host_data *hostdata = shost_priv(shost);
+
+ spin_lock_irq(shost->host_lock);
+ if (hostdata->io_reset)
+ complete_all(hostdata->io_reset);
+ hostdata->io_reset = NULL;
+ spin_unlock_irq(shost->host_lock);
+}
+
static void sym2_get_signalling(struct Scsi_Host *shost)
{
struct sym_hcb *np = sym_get_hcb(shost);
MODULE_DEVICE_TABLE(pci, sym2_id_table);
+static struct pci_error_handlers sym2_err_handler = {
+ .error_detected = sym2_io_error_detected,
+ .mmio_enabled = sym2_io_slot_dump,
+ .slot_reset = sym2_io_slot_reset,
+ .resume = sym2_io_resume,
+};
+
static struct pci_driver sym2_driver = {
.name = NAME53C8XX,
.id_table = sym2_id_table,
.probe = sym2_probe,
.remove = __devexit_p(sym2_remove),
+ .err_handler = &sym2_err_handler,
};
static int __init sym2_init(void)
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff